Good morning all!
Thought I'd pass along a little discovery I've recently made in cleaning things off the glass such as sharpie marker and the rust like spots from the factory, Mr. Clean Magic Eraser! Now I have no idea what's in these sponges so I always clean really good afterwards but so far I've not experienced any devit from them. Work great in the house too when I get around to actually cleaning anything!
Have a great day!